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- /*
- * tclCmdMZ.c --
- *
- * This file contains the top-level command routines for most of
- * the Tcl built-in commands whose names begin with the letters
- * M to Z. It contains only commands in the generic core (i.e.
- * those that don't depend much upon UNIX facilities).
- *
- * Copyright 1987-1991 Regents of the University of California
- * Permission to use, copy, modify, and distribute this
- * software and its documentation for any purpose and without
- * fee is hereby granted, provided that the above copyright
- * notice appear in all copies. The University of California
- * makes no representations about the suitability of this
- * software for any purpose. It is provided "as is" without
- * express or implied warranty.
- */
-
- #ifndef lint
- static char rcsid[] = "$Header: /user6/ouster/tcl/RCS/tclCmdMZ.c,v 1.13 92/04/23 11:07:54 ouster Exp $ SPRITE (Berkeley)";
- #endif
-
- #include "tclInt.h"
-
- /*
- * Structure used to hold information about variable traces:
- */
-
- typedef struct {
- int flags; /* Operations for which Tcl command is
- * to be invoked. */
- int length; /* Number of non-NULL chars. in command. */
- char command[4]; /* Space for Tcl command to invoke. Actual
- * size will be as large as necessary to
- * hold command. This field must be the
- * last in the structure, so that it can
- * be larger than 4 bytes. */
- } TraceVarInfo;
-
- /*
- * Forward declarations for procedures defined in this file:
- */
-
- static char * TraceVarProc _ANSI_ARGS_((ClientData clientData,
- Tcl_Interp *interp, char *name1, char *name2,
- int flags));
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_RegexpCmd --
- *
- * This procedure is invoked to process the "regexp" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_RegexpCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- int noCase = 0;
- int indices = 0;
- regexp *regexpPtr;
- char **argPtr, *string;
- int match, i;
-
- if (argc < 3) {
- wrongNumArgs:
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " ?-nocase? exp string ?matchVar? ?subMatchVar ",
- "subMatchVar ...?\"", (char *) NULL);
- return TCL_ERROR;
- }
- argPtr = argv+1;
- argc--;
- while ((argc > 0) && (argPtr[0][0] == '-')) {
- if (strcmp(argPtr[0], "-indices") == 0) {
- argPtr++;
- argc--;
- indices = 1;
- } else if (strcmp(argPtr[0], "-nocase") == 0) {
- argPtr++;
- argc--;
- noCase = 1;
- } else {
- break;
- }
- }
- if (argc < 2) {
- goto wrongNumArgs;
- }
- regexpPtr = TclCompileRegexp(interp, argPtr[0]);
- if (regexpPtr == NULL) {
- return TCL_ERROR;
- }
-
- /*
- * Convert the string to lower case, if desired, and perform
- * the match.
- */
-
- if (noCase) {
- register char *dst, *src;
-
- string = (char *) ckalloc((unsigned) (strlen(argPtr[1]) + 1));
- for (src = argPtr[1], dst = string; *src != 0; src++, dst++) {
- if (isupper(*src)) {
- *dst = tolower(*src);
- } else {
- *dst = *src;
- }
- }
- *dst = 0;
- } else {
- string = argPtr[1];
- }
- tclRegexpError = NULL;
- match = regexec(regexpPtr, string);
- if (string != argPtr[1]) {
- ckfree(string);
- }
- if (tclRegexpError != NULL) {
- Tcl_AppendResult(interp, "error while matching pattern: ",
- tclRegexpError, (char *) NULL);
- return TCL_ERROR;
- }
- if (!match) {
- interp->result = "0";
- return TCL_OK;
- }
-
- /*
- * If additional variable names have been specified, return
- * index information in those variables.
- */
-
- argc -= 2;
- if (argc > NSUBEXP) {
- interp->result = "too many substring variables";
- return TCL_ERROR;
- }
- for (i = 0; i < argc; i++) {
- char *result, info[50];
-
- if (regexpPtr->startp[i] == NULL) {
- if (indices) {
- result = Tcl_SetVar(interp, argPtr[i+2], "-1 -1", 0);
- } else {
- result = Tcl_SetVar(interp, argPtr[i+2], "", 0);
- }
- } else {
- if (indices) {
- sprintf(info, "%d %d", regexpPtr->startp[i] - string,
- regexpPtr->endp[i] - string - 1);
- result = Tcl_SetVar(interp, argPtr[i+2], info, 0);
- } else {
- char savedChar, *first, *last;
-
- first = argPtr[1] + (regexpPtr->startp[i] - string);
- last = argPtr[1] + (regexpPtr->endp[i] - string);
- savedChar = *last;
- *last = 0;
- result = Tcl_SetVar(interp, argPtr[i+2], first, 0);
- *last = savedChar;
- }
- }
- if (result == NULL) {
- Tcl_AppendResult(interp, "couldn't set variable \"",
- argPtr[i+2], "\"", (char *) NULL);
- return TCL_ERROR;
- }
- }
- interp->result = "1";
- return TCL_OK;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_RegsubCmd --
- *
- * This procedure is invoked to process the "regsub" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_RegsubCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- int noCase = 0, all = 0;
- regexp *regexpPtr;
- char *string, *p, *firstChar, *newValue, **argPtr;
- int match, result, flags;
- register char *src, c;
-
- if (argc < 5) {
- wrongNumArgs:
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " ?-nocase? ?-all? exp string subSpec varName\"", (char *) NULL);
- return TCL_ERROR;
- }
- argPtr = argv+1;
- argc--;
- while (argPtr[0][0] == '-') {
- if (strcmp(argPtr[0], "-nocase") == 0) {
- argPtr++;
- argc--;
- noCase = 1;
- } else if (strcmp(argPtr[0], "-all") == 0) {
- argPtr++;
- argc--;
- all = 1;
- } else {
- break;
- }
- }
- if (argc != 4) {
- goto wrongNumArgs;
- }
- regexpPtr = TclCompileRegexp(interp, argPtr[0]);
- if (regexpPtr == NULL) {
- return TCL_ERROR;
- }
-
- /*
- * Convert the string to lower case, if desired.
- */
-
- if (noCase) {
- register char *dst;
-
- string = (char *) ckalloc((unsigned) (strlen(argPtr[1]) + 1));
- for (src = argPtr[1], dst = string; *src != 0; src++, dst++) {
- if (isupper(*src)) {
- *dst = tolower(*src);
- } else {
- *dst = *src;
- }
- }
- *dst = 0;
- } else {
- string = argPtr[1];
- }
-
- /*
- * The following loop is to handle multiple matches within the
- * same source string; each iteration handles one match and its
- * corresponding substitution. If "-all" hasn't been specified
- * then the loop body only gets executed once.
- */
-
- flags = 0;
- for (p = string; *p != 0; ) {
- tclRegexpError = NULL;
- match = regexec(regexpPtr, p);
- if (tclRegexpError != NULL) {
- Tcl_AppendResult(interp, "error while matching pattern: ",
- tclRegexpError, (char *) NULL);
- result = TCL_ERROR;
- goto done;
- }
- if (!match) {
- break;
- }
-
- /*
- * Copy the portion of the source string before the match to the
- * result variable.
- */
-
- src = argPtr[1] + (regexpPtr->startp[0] - string);
- c = *src;
- *src = 0;
- newValue = Tcl_SetVar(interp, argPtr[3], argPtr[1] + (p - string),
- flags);
- *src = c;
- flags = TCL_APPEND_VALUE;
- if (newValue == NULL) {
- cantSet:
- Tcl_AppendResult(interp, "couldn't set variable \"",
- argPtr[3], "\"", (char *) NULL);
- result = TCL_ERROR;
- goto done;
- }
-
- /*
- * Append the subSpec argument to the variable, making appropriate
- * substitutions. This code is a bit hairy because of the backslash
- * conventions and because the code saves up ranges of characters in
- * subSpec to reduce the number of calls to Tcl_SetVar.
- */
-
- for (src = firstChar = argPtr[2], c = *src; c != 0; src++, c = *src) {
- int index;
-
- if (c == '&') {
- index = 0;
- } else if (c == '\\') {
- c = src[1];
- if ((c >= '0') && (c <= '9')) {
- index = c - '0';
- } else if ((c == '\\') || (c == '&')) {
- *src = c;
- src[1] = 0;
- newValue = Tcl_SetVar(interp, argPtr[3], firstChar,
- TCL_APPEND_VALUE);
- *src = '\\';
- src[1] = c;
- if (newValue == NULL) {
- goto cantSet;
- }
- firstChar = src+2;
- src++;
- continue;
- } else {
- continue;
- }
- } else {
- continue;
- }
- if (firstChar != src) {
- c = *src;
- *src = 0;
- newValue = Tcl_SetVar(interp, argPtr[3], firstChar,
- TCL_APPEND_VALUE);
- *src = c;
- if (newValue == NULL) {
- goto cantSet;
- }
- }
- if ((index < NSUBEXP) && (regexpPtr->startp[index] != NULL)
- && (regexpPtr->endp[index] != NULL)) {
- char *first, *last, saved;
-
- first = argPtr[1] + (regexpPtr->startp[index] - string);
- last = argPtr[1] + (regexpPtr->endp[index] - string);
- saved = *last;
- *last = 0;
- newValue = Tcl_SetVar(interp, argPtr[3], first,
- TCL_APPEND_VALUE);
- *last = saved;
- if (newValue == NULL) {
- goto cantSet;
- }
- }
- if (*src == '\\') {
- src++;
- }
- firstChar = src+1;
- }
- if (firstChar != src) {
- if (Tcl_SetVar(interp, argPtr[3], firstChar,
- TCL_APPEND_VALUE) == NULL) {
- goto cantSet;
- }
- }
- p = regexpPtr->endp[0];
- if (!all) {
- break;
- }
- }
-
- /*
- * If there were no matches at all, then return a "0" result.
- */
-
- if (p == string) {
- interp->result = "0";
- result = TCL_OK;
- goto done;
- }
-
- /*
- * Copy the portion of the source string after the last match to the
- * result variable.
- */
-
- if (*p != 0) {
- if (Tcl_SetVar(interp, argPtr[3], p, TCL_APPEND_VALUE) == NULL) {
- goto cantSet;
- }
- }
- interp->result = "1";
- result = TCL_OK;
-
- done:
- if (string != argPtr[1]) {
- ckfree(string);
- }
- return result;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_RenameCmd --
- *
- * This procedure is invoked to process the "rename" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_RenameCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- register Command *cmdPtr;
- Interp *iPtr = (Interp *) interp;
- Tcl_HashEntry *hPtr;
- int new;
-
- if (argc != 3) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " oldName newName\"", (char *) NULL);
- return TCL_ERROR;
- }
- if (argv[2][0] == '\0') {
- if (Tcl_DeleteCommand(interp, argv[1]) != 0) {
- Tcl_AppendResult(interp, "can't delete \"", argv[1],
- "\": command doesn't exist", (char *) NULL);
- return TCL_ERROR;
- }
- return TCL_OK;
- }
- hPtr = Tcl_FindHashEntry(&iPtr->commandTable, argv[2]);
- if (hPtr != NULL) {
- Tcl_AppendResult(interp, "can't rename to \"", argv[2],
- "\": command already exists", (char *) NULL);
- return TCL_ERROR;
- }
- hPtr = Tcl_FindHashEntry(&iPtr->commandTable, argv[1]);
- if (hPtr == NULL) {
- Tcl_AppendResult(interp, "can't rename \"", argv[1],
- "\": command doesn't exist", (char *) NULL);
- return TCL_ERROR;
- }
- cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
- Tcl_DeleteHashEntry(hPtr);
- hPtr = Tcl_CreateHashEntry(&iPtr->commandTable, argv[2], &new);
- Tcl_SetHashValue(hPtr, cmdPtr);
- return TCL_OK;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_ReturnCmd --
- *
- * This procedure is invoked to process the "return" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_ReturnCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- if (argc > 2) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " ?value?\"", (char *) NULL);
- return TCL_ERROR;
- }
- if (argc == 2) {
- Tcl_SetResult(interp, argv[1], TCL_VOLATILE);
- }
- return TCL_RETURN;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_ScanCmd --
- *
- * This procedure is invoked to process the "scan" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_ScanCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- int arg1Length; /* Number of bytes in argument to be
- * scanned. This gives an upper limit
- * on string field sizes. */
- # define MAX_FIELDS 20
- typedef struct {
- char fmt; /* Format for field. */
- int size; /* How many bytes to allow for
- * field. */
- char *location; /* Where field will be stored. */
- } Field;
- Field fields[MAX_FIELDS]; /* Info about all the fields in the
- * format string. */
- register Field *curField;
- int numFields = 0; /* Number of fields actually
- * specified. */
- int suppress; /* Current field is assignment-
- * suppressed. */
- int totalSize = 0; /* Number of bytes needed to store
- * all results combined. */
- char *results; /* Where scanned output goes. */
- int numScanned; /* sscanf's result. */
- register char *fmt;
- int i, widthSpecified;
-
- if (argc < 3) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " string format ?varName varName ...?\"", (char *) NULL);
- return TCL_ERROR;
- }
-
- /*
- * This procedure operates in four stages:
- * 1. Scan the format string, collecting information about each field.
- * 2. Allocate an array to hold all of the scanned fields.
- * 3. Call sscanf to do all the dirty work, and have it store the
- * parsed fields in the array.
- * 4. Pick off the fields from the array and assign them to variables.
- */
-
- arg1Length = (strlen(argv[1]) + 4) & ~03;
- for (fmt = argv[2]; *fmt != 0; fmt++) {
- if (*fmt != '%') {
- continue;
- }
- fmt++;
- if (*fmt == '*') {
- suppress = 1;
- fmt++;
- } else {
- suppress = 0;
- }
- widthSpecified = 0;
- while (isdigit(*fmt)) {
- widthSpecified = 1;
- fmt++;
- }
- if (suppress) {
- continue;
- }
- if (numFields == MAX_FIELDS) {
- interp->result = "too many fields to scan";
- return TCL_ERROR;
- }
- curField = &fields[numFields];
- numFields++;
- switch (*fmt) {
- case 'D':
- case 'O':
- case 'X':
- case 'd':
- case 'o':
- case 'x':
- curField->fmt = 'd';
- curField->size = sizeof(int);
- break;
-
- case 's':
- curField->fmt = 's';
- curField->size = arg1Length;
- break;
-
- case 'c':
- if (widthSpecified) {
- interp->result =
- "field width may not be specified in %c conversion";
- return TCL_ERROR;
- }
- curField->fmt = 'c';
- curField->size = sizeof(int);
- break;
-
- case 'E':
- case 'F':
- curField->fmt = 'F';
- curField->size = sizeof(double);
- break;
-
- case 'e':
- case 'f':
- curField->fmt = 'f';
- curField->size = sizeof(float);
- break;
-
- case '[':
- curField->fmt = 's';
- curField->size = arg1Length;
- do {
- fmt++;
- } while (*fmt != ']');
- break;
-
- default:
- sprintf(interp->result, "bad scan conversion character \"%c\"",
- *fmt);
- return TCL_ERROR;
- }
- totalSize += curField->size;
- }
-
- if (numFields != (argc-3)) {
- interp->result =
- "different numbers of variable names and field specifiers";
- return TCL_ERROR;
- }
-
- /*
- * Step 2:
- */
-
- results = (char *) ckalloc((unsigned) totalSize);
- for (i = 0, totalSize = 0, curField = fields;
- i < numFields; i++, curField++) {
- curField->location = results + totalSize;
- totalSize += curField->size;
- }
-
- /*
- * Step 3:
- */
-
- numScanned = sscanf(argv[1], argv[2],
- fields[0].location, fields[1].location, fields[2].location,
- fields[3].location, fields[4].location, fields[5].location,
- fields[6].location, fields[7].location, fields[8].location,
- fields[9].location, fields[10].location, fields[11].location,
- fields[12].location, fields[13].location, fields[14].location,
- fields[15].location, fields[16].location, fields[17].location,
- fields[18].location, fields[19].location);
-
- /*
- * Step 4:
- */
-
- if (numScanned < numFields) {
- numFields = numScanned;
- }
- for (i = 0, curField = fields; i < numFields; i++, curField++) {
- switch (curField->fmt) {
- char string[120];
-
- case 'd':
- sprintf(string, "%d", *((int *) curField->location));
- if (Tcl_SetVar(interp, argv[i+3], string, 0) == NULL) {
- storeError:
- Tcl_AppendResult(interp,
- "couldn't set variable \"", argv[i+3], "\"",
- (char *) NULL);
- ckfree((char *) results);
- return TCL_ERROR;
- }
- break;
-
- case 'c':
- sprintf(string, "%d", *((char *) curField->location) & 0xff);
- if (Tcl_SetVar(interp, argv[i+3], string, 0) == NULL) {
- goto storeError;
- }
- break;
-
- case 's':
- if (Tcl_SetVar(interp, argv[i+3], curField->location, 0)
- == NULL) {
- goto storeError;
- }
- break;
-
- case 'F':
- sprintf(string, "%g", *((double *) curField->location));
- if (Tcl_SetVar(interp, argv[i+3], string, 0) == NULL) {
- goto storeError;
- }
- break;
-
- case 'f':
- sprintf(string, "%g", *((float *) curField->location));
- if (Tcl_SetVar(interp, argv[i+3], string, 0) == NULL) {
- goto storeError;
- }
- break;
- }
- }
- ckfree(results);
- sprintf(interp->result, "%d", numScanned);
- return TCL_OK;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_SplitCmd --
- *
- * This procedure is invoked to process the "split" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_SplitCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- char *splitChars;
- register char *p, *p2;
- char *elementStart;
-
- if (argc == 2) {
- splitChars = " \n\t\r";
- } else if (argc == 3) {
- splitChars = argv[2];
- } else {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " string ?splitChars?\"", (char *) NULL);
- return TCL_ERROR;
- }
-
- /*
- * Handle the special case of splitting on every character.
- */
-
- if (*splitChars == 0) {
- char string[2];
- string[1] = 0;
- for (p = argv[1]; *p != 0; p++) {
- string[0] = *p;
- Tcl_AppendElement(interp, string, 0);
- }
- return TCL_OK;
- }
-
- /*
- * Normal case: split on any of a given set of characters.
- * Discard instances of the split characters.
- */
-
- for (p = elementStart = argv[1]; *p != 0; p++) {
- char c = *p;
- for (p2 = splitChars; *p2 != 0; p2++) {
- if (*p2 == c) {
- *p = 0;
- Tcl_AppendElement(interp, elementStart, 0);
- *p = c;
- elementStart = p+1;
- break;
- }
- }
- }
- if (p != argv[1]) {
- Tcl_AppendElement(interp, elementStart, 0);
- }
- return TCL_OK;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_StringCmd --
- *
- * This procedure is invoked to process the "string" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_StringCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- int length;
- register char *p, c;
- int match;
- int first;
- int left = 0, right = 0;
-
- if (argc < 2) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " option arg ?arg ...?\"", (char *) NULL);
- return TCL_ERROR;
- }
- c = argv[1][0];
- length = strlen(argv[1]);
- if ((c == 'c') && (strncmp(argv[1], "compare", length) == 0)) {
- if (argc != 4) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " compare string1 string2\"", (char *) NULL);
- return TCL_ERROR;
- }
- match = strcmp(argv[2], argv[3]);
- if (match > 0) {
- interp->result = "1";
- } else if (match < 0) {
- interp->result = "-1";
- } else {
- interp->result = "0";
- }
- return TCL_OK;
- } else if ((c == 'f') && (strncmp(argv[1], "first", length) == 0)) {
- if (argc != 4) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " first string1 string2\"", (char *) NULL);
- return TCL_ERROR;
- }
- first = 1;
-
- firstLast:
- match = -1;
- c = *argv[2];
- length = strlen(argv[2]);
- for (p = argv[3]; *p != 0; p++) {
- if (*p != c) {
- continue;
- }
- if (strncmp(argv[2], p, length) == 0) {
- match = p-argv[3];
- if (first) {
- break;
- }
- }
- }
- sprintf(interp->result, "%d", match);
- return TCL_OK;
- } else if ((c == 'i') && (strncmp(argv[1], "index", length) == 0)) {
- int index;
-
- if (argc != 4) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " index string charIndex\"", (char *) NULL);
- return TCL_ERROR;
- }
- if (Tcl_GetInt(interp, argv[3], &index) != TCL_OK) {
- return TCL_ERROR;
- }
- if ((index >= 0) && (index < strlen(argv[2]))) {
- interp->result[0] = argv[2][index];
- interp->result[1] = 0;
- }
- return TCL_OK;
- } else if ((c == 'l') && (strncmp(argv[1], "last", length) == 0)
- && (length >= 2)) {
- if (argc != 4) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " last string1 string2\"", (char *) NULL);
- return TCL_ERROR;
- }
- first = 0;
- goto firstLast;
- } else if ((c == 'l') && (strncmp(argv[1], "length", length) == 0)
- && (length >= 2)) {
- if (argc != 3) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " length string\"", (char *) NULL);
- return TCL_ERROR;
- }
- sprintf(interp->result, "%d", strlen(argv[2]));
- return TCL_OK;
- } else if ((c == 'm') && (strncmp(argv[1], "match", length) == 0)) {
- if (argc != 4) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " match pattern string\"", (char *) NULL);
- return TCL_ERROR;
- }
- if (Tcl_StringMatch(argv[3], argv[2]) != 0) {
- interp->result = "1";
- } else {
- interp->result = "0";
- }
- return TCL_OK;
- } else if ((c == 'r') && (strncmp(argv[1], "range", length) == 0)) {
- int first, last, stringLength;
-
- if (argc != 5) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " range string first last\"", (char *) NULL);
- return TCL_ERROR;
- }
- stringLength = strlen(argv[2]);
- if (Tcl_GetInt(interp, argv[3], &first) != TCL_OK) {
- return TCL_ERROR;
- }
- if ((*argv[4] == 'e')
- && (strncmp(argv[4], "end", strlen(argv[4])) == 0)) {
- last = stringLength-1;
- } else {
- if (Tcl_GetInt(interp, argv[4], &last) != TCL_OK) {
- Tcl_ResetResult(interp);
- Tcl_AppendResult(interp,
- "expected integer or \"end\" but got \"",
- argv[4], "\"", (char *) NULL);
- return TCL_ERROR;
- }
- }
- if (first < 0) {
- first = 0;
- }
- if (last >= stringLength) {
- last = stringLength-1;
- }
- if (last >= first) {
- char saved, *p;
-
- p = argv[2] + last + 1;
- saved = *p;
- *p = 0;
- Tcl_SetResult(interp, argv[2] + first, TCL_VOLATILE);
- *p = saved;
- }
- return TCL_OK;
- } else if ((c == 't') && (strncmp(argv[1], "tolower", length) == 0)
- && (length >= 3)) {
- register char *p;
-
- if (argc != 3) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " tolower string\"", (char *) NULL);
- return TCL_ERROR;
- }
- Tcl_SetResult(interp, argv[2], TCL_VOLATILE);
- for (p = interp->result; *p != 0; p++) {
- if (isupper(*p)) {
- *p = tolower(*p);
- }
- }
- return TCL_OK;
- } else if ((c == 't') && (strncmp(argv[1], "toupper", length) == 0)
- && (length >= 3)) {
- register char *p;
-
- if (argc != 3) {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " toupper string\"", (char *) NULL);
- return TCL_ERROR;
- }
- Tcl_SetResult(interp, argv[2], TCL_VOLATILE);
- for (p = interp->result; *p != 0; p++) {
- if (islower(*p)) {
- *p = toupper(*p);
- }
- }
- return TCL_OK;
- } else if ((c == 't') && (strncmp(argv[1], "trim", length) == 0)
- && (length == 4)) {
- char *trimChars;
- register char *p, *checkPtr;
-
- left = right = 1;
-
- trim:
- if (argc == 4) {
- trimChars = argv[3];
- } else if (argc == 3) {
- trimChars = " \t\n\r";
- } else {
- Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
- " ", argv[1], " string ?chars?\"", (char *) NULL);
- return TCL_ERROR;
- }
- p = argv[2];
- if (left) {
- for (c = *p; c != 0; p++, c = *p) {
- for (checkPtr = trimChars; *checkPtr != c; checkPtr++) {
- if (*checkPtr == 0) {
- goto doneLeft;
- }
- }
- }
- }
- doneLeft:
- Tcl_SetResult(interp, p, TCL_VOLATILE);
- if (right) {
- char *donePtr;
-
- p = interp->result + strlen(interp->result) - 1;
- donePtr = &interp->result[-1];
- for (c = *p; p != donePtr; p--, c = *p) {
- for (checkPtr = trimChars; *checkPtr != c; checkPtr++) {
- if (*checkPtr == 0) {
- goto doneRight;
- }
- }
- }
- doneRight:
- p[1] = 0;
- }
- return TCL_OK;
- } else if ((c == 't') && (strncmp(argv[1], "trimleft", length) == 0)
- && (length > 4)) {
- left = 1;
- argv[1] = "trimleft";
- goto trim;
- } else if ((c == 't') && (strncmp(argv[1], "trimright", length) == 0)
- && (length > 4)) {
- right = 1;
- argv[1] = "trimright";
- goto trim;
- } else {
- Tcl_AppendResult(interp, "bad option \"", argv[1],
- "\": should be compare, first, index, last, length, match, ",
- "range, tolower, toupper, trim, trimleft, or trimright",
- (char *) NULL);
- return TCL_ERROR;
- }
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_TraceCmd --
- *
- * This procedure is invoked to process the "trace" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_TraceCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- char c;
- int length;
-
- if (argc < 2) {
- Tcl_AppendResult(interp, "too few args: should be \"",
- argv[0], " option [arg arg ...]\"", (char *) NULL);
- return TCL_ERROR;
- }
- c = argv[1][1];
- length = strlen(argv[1]);
- if ((c == 'a') && (strncmp(argv[1], "variable", length) == 0)
- && (length >= 2)) {
- char *p;
- int flags, length;
- TraceVarInfo *tvarPtr;
-
- if (argc != 5) {
- Tcl_AppendResult(interp, "wrong # args: should be \"",
- argv[0], " variable name ops command\"", (char *) NULL);
- return TCL_ERROR;
- }
-
- flags = 0;
- for (p = argv[3] ; *p != 0; p++) {
- if (*p == 'r') {
- flags |= TCL_TRACE_READS;
- } else if (*p == 'w') {
- flags |= TCL_TRACE_WRITES;
- } else if (*p == 'u') {
- flags |= TCL_TRACE_UNSETS;
- } else {
- goto badOps;
- }
- }
- if (flags == 0) {
- goto badOps;
- }
-
- length = strlen(argv[4]);
- tvarPtr = (TraceVarInfo *) ckalloc((unsigned)
- (sizeof(TraceVarInfo) - sizeof(tvarPtr->command) + length + 1));
- tvarPtr->flags = flags;
- tvarPtr->length = length;
- flags |= TCL_TRACE_UNSETS;
- strcpy(tvarPtr->command, argv[4]);
- if (Tcl_TraceVar(interp, argv[2], flags, TraceVarProc,
- (ClientData) tvarPtr) != TCL_OK) {
- ckfree((char *) tvarPtr);
- return TCL_ERROR;
- }
- } else if ((c == 'd') && (strncmp(argv[1], "vdelete", length)
- && (length >= 2)) == 0) {
- char *p;
- int flags, length;
- TraceVarInfo *tvarPtr;
- ClientData clientData;
-
- if (argc != 5) {
- Tcl_AppendResult(interp, "wrong # args: should be \"",
- argv[0], " vdelete name ops command\"", (char *) NULL);
- return TCL_ERROR;
- }
-
- flags = 0;
- for (p = argv[3] ; *p != 0; p++) {
- if (*p == 'r') {
- flags |= TCL_TRACE_READS;
- } else if (*p == 'w') {
- flags |= TCL_TRACE_WRITES;
- } else if (*p == 'u') {
- flags |= TCL_TRACE_UNSETS;
- } else {
- goto badOps;
- }
- }
- if (flags == 0) {
- goto badOps;
- }
-
- /*
- * Search through all of our traces on this variable to
- * see if there's one with the given command. If so, then
- * delete the first one that matches.
- */
-
- length = strlen(argv[4]);
- clientData = 0;
- while ((clientData = Tcl_VarTraceInfo(interp, argv[2], 0,
- TraceVarProc, clientData)) != 0) {
- tvarPtr = (TraceVarInfo *) clientData;
- if ((tvarPtr->length == length) && (tvarPtr->flags == flags)
- && (strncmp(argv[4], tvarPtr->command, length) == 0)) {
- Tcl_UntraceVar(interp, argv[2], flags | TCL_TRACE_UNSETS,
- TraceVarProc, clientData);
- ckfree((char *) tvarPtr);
- break;
- }
- }
- } else if ((c == 'i') && (strncmp(argv[1], "vinfo", length) == 0)
- && (length >= 2)) {
- ClientData clientData;
- char ops[4], *p;
- char *prefix = "{";
-
- if (argc != 3) {
- Tcl_AppendResult(interp, "wrong # args: should be \"",
- argv[0], " vinfo name\"", (char *) NULL);
- return TCL_ERROR;
- }
- clientData = 0;
- while ((clientData = Tcl_VarTraceInfo(interp, argv[2], 0,
- TraceVarProc, clientData)) != 0) {
- TraceVarInfo *tvarPtr = (TraceVarInfo *) clientData;
- p = ops;
- if (tvarPtr->flags & TCL_TRACE_READS) {
- *p = 'r';
- p++;
- }
- if (tvarPtr->flags & TCL_TRACE_WRITES) {
- *p = 'w';
- p++;
- }
- if (tvarPtr->flags & TCL_TRACE_UNSETS) {
- *p = 'u';
- p++;
- }
- *p = '\0';
- Tcl_AppendResult(interp, prefix, (char *) NULL);
- Tcl_AppendElement(interp, ops, 1);
- Tcl_AppendElement(interp, tvarPtr->command, 0);
- Tcl_AppendResult(interp, "}", (char *) NULL);
- prefix = " {";
- }
- } else {
- Tcl_AppendResult(interp, "bad option \"", argv[1],
- "\": should be variable, vdelete, or vinfo",
- (char *) NULL);
- return TCL_ERROR;
- }
- return TCL_OK;
-
- badOps:
- Tcl_AppendResult(interp, "bad operations \"", argv[3],
- "\": should be one or more of rwu", (char *) NULL);
- return TCL_ERROR;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * TraceVarProc --
- *
- * This procedure is called to handle variable accesses that have
- * been traced using the "trace" command.
- *
- * Results:
- * Normally returns NULL. If the trace command returns an error,
- * then this procedure returns an error string.
- *
- * Side effects:
- * Depends on the command associated with the trace.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- static char *
- TraceVarProc(clientData, interp, name1, name2, flags)
- ClientData clientData; /* Information about the variable trace. */
- Tcl_Interp *interp; /* Interpreter containing variable. */
- char *name1; /* Name of variable or array. */
- char *name2; /* Name of element within array; NULL means
- * scalar variable is being referenced. */
- int flags; /* OR-ed bits giving operation and other
- * information. */
- {
- TraceVarInfo *tvarPtr = (TraceVarInfo *) clientData;
- char *result;
- int code, cmdLength, flags1, flags2;
- Interp dummy;
- #define STATIC_SIZE 199
- char staticSpace[STATIC_SIZE+1];
- char *cmdPtr, *p;
-
- result = NULL;
- if ((tvarPtr->flags & flags) && !(flags & TCL_INTERP_DESTROYED)) {
-
- /*
- * Generate a command to execute by appending list elements
- * for the two variable names and the operation. The five
- * extra characters are for three space, the opcode character,
- * and the terminating null.
- */
-
- if (name2 == NULL) {
- name2 = "";
- }
- cmdLength = tvarPtr->length + Tcl_ScanElement(name1, &flags1) +
- Tcl_ScanElement(name2, &flags2) + 5;
- if (cmdLength < STATIC_SIZE) {
- cmdPtr = staticSpace;
- } else {
- cmdPtr = (char *) ckalloc((unsigned) cmdLength);
- }
- p = cmdPtr;
- strcpy(p, tvarPtr->command);
- p += tvarPtr->length;
- *p = ' ';
- p++;
- p += Tcl_ConvertElement(name1, p, flags1);
- *p = ' ';
- p++;
- p += Tcl_ConvertElement(name2, p, flags2);
- *p = ' ';
- if (flags & TCL_TRACE_READS) {
- p[1] = 'r';
- } else if (flags & TCL_TRACE_WRITES) {
- p[1] = 'w';
- } else if (flags & TCL_TRACE_UNSETS) {
- p[1] = 'u';
- }
- p[2] = '\0';
-
- /*
- * Execute the command. Be careful to save and restore the
- * result from the interpreter used for the command.
- */
-
- dummy.freeProc = interp->freeProc;
- if (interp->freeProc == 0) {
- Tcl_SetResult((Tcl_Interp *) &dummy, interp->result, TCL_VOLATILE);
- } else {
- dummy.result = interp->result;
- }
- code = Tcl_Eval(interp, cmdPtr, 0, (char **) NULL);
- if (cmdPtr != staticSpace) {
- ckfree(cmdPtr);
- }
- if (code != TCL_OK) {
- result = "access disallowed by trace command";
- Tcl_ResetResult(interp); /* Must clear error state. */
- }
- Tcl_FreeResult(interp);
- interp->result = dummy.result;
- interp->freeProc = dummy.freeProc;
- }
- if (flags & TCL_TRACE_DESTROYED) {
- ckfree((char *) tvarPtr);
- }
- return result;
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * Tcl_WhileCmd --
- *
- * This procedure is invoked to process the "while" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- int
- Tcl_WhileCmd(dummy, interp, argc, argv)
- ClientData dummy; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- char **argv; /* Argument strings. */
- {
- int result, value;
-
- if (argc != 3) {
- Tcl_AppendResult(interp, "wrong # args: should be \"",
- argv[0], " test command\"", (char *) NULL);
- return TCL_ERROR;
- }
-
- while (1) {
- result = Tcl_ExprBoolean(interp, argv[1], &value);
- if (result != TCL_OK) {
- return result;
- }
- if (!value) {
- break;
- }
- result = Tcl_Eval(interp, argv[2], 0, (char **) NULL);
- if (result == TCL_CONTINUE) {
- result = TCL_OK;
- } else if (result != TCL_OK) {
- if (result == TCL_ERROR) {
- char msg[60];
- sprintf(msg, "\n (\"while\" body line %d)",
- interp->errorLine);
- Tcl_AddErrorInfo(interp, msg);
- }
- break;
- }
- }
- if (result == TCL_BREAK) {
- result = TCL_OK;
- }
- if (result == TCL_OK) {
- Tcl_ResetResult(interp);
- }
- return result;
- }
-